Here is the link-
http://www.reefcentral.com/forums/showthread.php?t=1766100">http://www.reefcentral.com/forums/showthread.php?t=1766100</a>
This product uses polycaprolactone, which is a biodegradebale polyester. There are also links in this thread for a DIY source of polycaprolactone beads/pellets, if you want to try that.